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Hydrolyzed collagen (HC) is a popular ingredient considered to be an antioxidant

While oral glutathione is generally considered to be safe, there is not enough data to recommend long-term use, especially for women who are pregnant or breastfeeding, people who take prescription or over-the-counter drugs, and those who have chronic conditions, says Malhotra

It's known as a prodrug of cysteine, meaning that it converts to cysteine in the body

Pyridoxal kinase itself requires zinc for activation

The Finkley 2005 study on 67 women aged 50 to 59 reported improvements in laxity, clarity, firmness, fine lines, wrinkles, and pigmentation across the face after 12 weeks